Rotatable chimney cowl



FIG. 1 is a front elevational view of a rotatable chimney cowl showing my new design;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image of the right side shown.

FIG. 3 is a top plan view thereof; and

FIG. 4 is a rear elevational view thereof. 

The ornamental design for a rotatable chimney cowl, as shown and described. 